Hack saw



Aug. 26, 1958 FIG.5

INVENTOR. CARL E.T|DEMAN ATTORNEY United States Patent Ofiice 2,849,040 Patented Aug. 26, 1958 2,849,040 HACK SAW Carl E. Tideman, Millbury, Mass., assignor to Tideman Manufacturing Co., Inc., Millbury, Mass., a corporation of Massachusetts Application September 16, 1957, Serial No. 684,327 3 Claims. (Cl. 145-34) This invention relates to a new and improved hacksaw and more particularly to an adjustable tubular hacksaw frame having new and improved saw blade holding means providing for greater rigidity and strength of the parts; easier adjustment both for tension of the blade and for different sizes of blades; and a hack-saw frame in general having a construction which is less expensive to manufacture and at the same time provides for a greatly improved device particularly with respect to the frame therefor and the blade holding means.

Other objects include the provision of a new and improved and less expensive hack-saw frame providing for cutting a thicker workpiece; a new and improved handle construction; a new and improved tubular frame member adjustment construction; and a new and improved blade-holding pin, the same being tapered and cooperating with a pressed and channeled tubular frame member terminal portion, the same providing increased strength and rigidity to the entire frame.

Other objects and advantages of the invention will appear more fully hereinafter.

Reference is to be had to the accompanying drawings, in Which:

Fig. 1 is a view in elevation of the new hack-saw, parts being in section;

Fig. 2 is an enlarged plan view partly in section, looking in the direction of arrow 2 in Fig. 1;

Fig. 3 is an enlarged bottom plan view with part in section, looking in the direction of arrow 3 in Fig. 1;

Fig. 4 is an enlarged section on line 4-4 of Fig. 1;

Fig. 5 is an enlarged section through a part of the frame construction illustrating the adjustment means.

The present invention comprises a hack-saw which is principally formed of two tubular parts. These tubular parts are bent to the shapes desired and are of different diameters so that one may telescope in the other. One tubular member is generally indicated at 10, this member being bent at 12 forming an arm 14. This arm 14 is transversely pressed at its end as at 16 forming a generally flat terminal portion which is apertured to provide for the reception of a threaded pin 18. Threaded pin 18 is provided with the usual lateral pin 20 for holding the blade 22. Pin 18 as usual is provided with a square portion, and an aperture through the flat area 16 conforms to this shape to prevent rotation of the pin 18. Pin 18 is provided with a wing nut 24 for adjusting the tension on the blade 22 and nut 24 bears against the outside aspect of the flattened portion 16 as is readily apparent in Figs. 1 and 3.

In pressing the terminal portion 14 of member 10, a channel is provided as clearly shown in Fig. 3, this channel being formed by the in-turned edge flanges 26, 28 as shown. This construction not only provides a flat terminal portion for the pin 18 but by this very simple means there is also provided a double thickness comprising the opposite walls of the tubular member squeezed together and the in-turned strengthening flanges 26 and 28. This provides a very rigid and strong construction at the point where it is needed, i. e., where the saw blade is attached and supported.

The other tubular member is generally indicated at 30 and this is bent into a general U-shape having a longer leg 32 and a shorter leg 34. The intermediate portion of member 30 between the two legs is formed on a curve which in and of itself provides a very strong and convenient handle portion for the saw. The shorter leg 34 is bent up as at 36 and flattened not only in the bent up portion indicated at 38 but also in the proximate portion 40 thereof. The bent portion 38 forms a flat member which is apertured to receive a blade securing pin 42 and this area is formed of the two walls of the tubular member as in the case of the flattened area 16,

together with strengthening edge flanges 44 and 46 as clearly shown in Fig. 2. Flanges 44 and 46 extend into and merge with side flanges 48 and 50 and this construction provides an extremely strong and rigid saw blade holding end portion for member 30.

There is preferably provided an enlarged handle portion 52 which surrounds and encloses the curved handle area, and this handle may be molded directly thereon or it may be made in two parts and adhesively applied to the tubular member. This handle provides an enlarged firm gripping means for the saw frame and where the handle is made in two parts and adhesively secured it may be provided with in-turned ends such as at 54 to locate and grip the outside surface of the tubular member 30.

The pin 42 is provided with a blade holding member 56 similar to that at 20 and is generally cylindrical, but is provided with a large conical head 58. This is larger in diameter than an aperture at 60 through the terminal portion 38, so that the head 58 may be wedged in the aperture 60. When nut 24 is turned up to tighten the blade, the head 58 provides a firm anchoring means for the pin 42 and also for the blade.

The longer leg 32 of member 30 is reduced in diameter at 62 providing a guide to slidingly receive the end portion 64 of the frame member 10. The reduced portion is indicated at 66 and is provided with an aperture for the reception of a thumb-screw 68 which is selectively threaded into either one of two separate threaded holes 70 or 72 in the member 10 for adjusting the length of the hack-saw frame to accommodate different lengths of blades 22. By providing the tubular member 30 originally oversize, a good handle portion is provided even in the absence of the applied handle 52.

It will be seen that this invention provides a very simple, inexpensive, and easily manufactured hack-saw which nevertheless is extremely strong, rigid and rugged having little liklihood to break or fail. The hack-saw is easily adjusted both for length of blade and tension of the blade and it may be utilized to saw through very thick members due to the relatively extended length of member 14 and the handle portion of member 30. Blades may be applied and tightened more or less in the usual manner but the ends of the frame for holding the blades are greatly strengthened and improved through the very simple process of pressing the respective ends of the tubular members to provide the flat channeled construction as at 16 and 38 above described.

Having thus described my invention and the advantages thereof, I do not wish to be limited to the details herein disclosed, otherwise than as set forth in the claims, but what I claim is:

1. A hack-saw comprising a pair of tubular members one of which is of lesser diameter than the other and telescopes therewithin, the one tubular member including a down-turned arm, a flat pressed end portion on the down-turned arm, side flanges on the flat end portion, said flat end portion being apertured, a blade-holding pin in the aperture, the other telescoping tubular member being in the form of a U, one leg of which slidingly receives the said one tubular member, a detachable connection in the telescoping portions of said tubular members, the other leg of the-U being pressed to form a flat end portion at an angle to said other leg, the same being apertured, a blade-holding 'pin in the aperture, and means on the last-named pin for holding the blade, said flat end portions being substantially parallel.

2. A hack-saw comprising a pair-of tubular members one of which is of lesser diameter than the other and telescopes therewithin, said one tubular member including a down-turned arm, a flat pressed end portion on the down-turned arm, side flanges on the flat end portion, said flat end portion being apertured, a blade-holding pin in the aperture, the other telescoping tubular member being in the form of a U, one leg of which slidingly receives the said one tubular member, a detachable connection in the telescoping portions ofsaid tubular members, the other leg of the U being pressed to form a fiat end portion at an angle to said other leg, the same being apertured, a blade-holding pin in the aperture, and means on the last-named pin for holding the blade, said fiat end portions being substantially parallel, the "flat '4 end portion of the U-shaped member extending inwardly toward the said one leg thereof, the flat end portion on the arm extending in the opposite direction.

3. A hack-saw comprising a pair of tubular members one of which telescopes within the other, one tubular member including an apertured down-turned arm portion, a double wall flat end portion on the down-turned arm portion, a blade-holding pin in the aperture, the other telescoping tubular member being in the form of a U providing a handle, one leg of the U slidingly receiving the first tubular member, a detachable connection in the telescoping portions of said tubular members, a flat double wall end portion on the other leg of the U, means to hold the blade thereto, and edge channel flanges on the fiat end portions.

References Cited in the file of this patent UNITED STATES PATENTS 2,612,196 Bouschor Sept. 30, 1952 2,703,121 Jolie n Mar. 1, 1955 FOREIGN PATENTS 825,475 Germany Dec. 20, 1951 839,704 Germany May 23, 1952 

